LoCoS (short for Lovers Communication System) is a pictorial language developed by Yukio Ota of Japan in 1964. It was meant as communication for the deaf and mute as well as for the illiterate. It is
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af6c4dbddcd1b396b99832b06427ff768b13c9947161fddbd6680dc705383ca. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91d9f28e-1508-4051-b7cd-0d4b2ca0f89e.json and https://artists.proofprofile.net/proofs/artist/91d9f28e-1508-4051-b7cd-0d4b2ca0f89e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffd900a04501f8407242159fb78f4806155f6c7a5baf68b17e202871d93d65a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BX0BA2200001.
Poesia Acústica #9: Melhor Forma (LOCOS Remix)
Poesia Acústica #9: Melhor Forma - LOCOS Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826e10af3509df9221525e327f60cc85573201ad371207b869fe3b6494d1fc6e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BC7F22200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9165428c51eccb95b87496ffb143228cf763246350602a559658c500fd6cda61. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BC7F22200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ccafac9db170817f9ddfe3b83362319fde51f2a074a71d9ac49c9516f4cdad. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BC7F22300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cca819850ffce4faa12c0bc6bd79b5db466d402fc8b152fee3a113cd4adba8a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BCJBI2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e359c3c07ba189059b3b6b25b799b2e10bb7b052d01c60e3778deae8a0f9ea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BC7F22400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe3d7b80ae84ce5da1c594f3720412e9a06f8ba10e45d3873e250d30d11548d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BCQAB2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb515849a8d78be72ed6baaaa8441bf6625adf85b18c1e9a42605e7de0007967. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BC7F22100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a237030b0c2f685f613941599143a26ed21beda4230525b36f8b98035bf030. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXVK62300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8dbd1ec1522aa16a3953b8887e860fc270ec110bd79956d368a683c3a9807b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BC3RD2300048.